Try checking behind the air intake plenum. It should be a round thing.
Where is the fuel pressure regulator located on a 1989 chevy silvarado with 5.7 liter engine
where is located the fuel injector presssure regulator on a 1999 ford explorer 5.0 liter engine?
If you look at it you will see a vacuum line hooked to it, while the engine is running unplug it and the engine sound should change. If it don't then the regulator is bad. You can also hook up a fuel pressure gauge to the fuel line and read what the pressure is while engine is idleing and then unplug the regulator and the fuel pressure should go up a few LBS. If not replace regulator.
The regulator is on the right said if its a 4 liter engine. In front of the oil cap it has thin wire under it
on 3.8 liter v6 they have problems with fuel pressure regulator or stuck open injector
The fuel pressure regulator has one bolt holding it in place.l
The 1998 Ford Windstar Owner Guide shows ( 4.5 quarts with engine oil filter change ) for the 3.0 liter and 3.8 liter V6 engines
It is in the throttle body.
For the VIN "T" 5.3 liter V-8, the fuel pressure regulator is mounted in the center of the fuel bar on the driver's side of the engine.
The fuel pressure regulator on a 2002 Ford F-150 5.4 liter V8 is located just behind the fuel rail. It is situated near the fuel injectors to ensure proper flow.
Find the little silver regulator bolted to the fuel rail with a vacuum hose attached. The screws go through the bracket and screw into the regulator. Be careful to have rags to catch the fuel and wear eye protection to keep the gas out of your eyes when it sprays.
According to the 1998 Ford Windstar Owner Guide : With engine oil filter change : ( 4.5 quarts of engine oil ) for both the 3.0 liter and the 3.8 liter engines